<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>河北</title>
    <style>
        .s1 {
            margin-left: 100px;
        }
        .selected {
            background-color: aqua;
        }
    </style>
</head>
<body>
    <div>
        <h1>省份</h1>
        <ul>
            <li><a href="./hebei.html" class="selected">河北省</a></li>
            <li><a href="./henan.html">河南省</a></li>
        </ul>
    </div>
    <div class="s1">
        <h2>市区</h2>
        <ul>
            <li>石家庄</li>
            <li>唐山</li>
            <li>保定</li>
            <li>邯郸</li>
        </ul>
    </div>

</body>
</html>